CN103496833B - Bottom sediment heavy metal pollution modularized ex situ treatment method - Google Patents

Bottom sediment heavy metal pollution modularized ex situ treatment method Download PDF

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CN103496833B
CN103496833B CN201310498149.2A CN201310498149A CN103496833B CN 103496833 B CN103496833 B CN 103496833B CN 201310498149 A CN201310498149 A CN 201310498149A CN 103496833 B CN103496833 B CN 103496833B
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module
dystopy
heavy metal
adopt
bed mud
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CN201310498149.2A
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CN103496833A (en
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康兴生
马涛
刘亚钦
刘娟
崔海燕
王菁
杨洋
顾俊杰
孙丰凯
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山东省环境保护科学研究设计院
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Abstract

A bottom sediment heavy metal pollution modularized ex situ treatment method comprises a impurity removing module, a bottom sediment dredging module, a sediment separating module, a slurry dewatering and volume reducing module, a solidification stabilizing module, a tail water treating module, a resource utilization module and a field ecological remediation module. The modules are combined according to detailed conditions and treatment orientation of the bottom sediment fields. The bottom sediment dredging module, the slurry dewatering and volume reducing module, the tail water treating module and the field ecological remediation module are affirmatively chosen items in the eight modules, and the remaining modules are implemented and selected flexibly according to the detailed conditions. The treatment method fully combines pollution regulation plans of different places and technology implementing difficulty of polluted water bodies, adjusts measures to local conditions, modularizes and stylizes main treating technology links, and can be used for reference and operated conveniently. When the modules are practically used, combined with specific conditions of fields, the modules can be combined freely. Consequently, the method is simple to operate and convenient to implement.

Description

Heavy Metal Pollution in Sediments modularization dystopy improvement method
Technical field
The present invention relates to a kind of method that is subject to the bed mud of heavy metal contamination for administering reparation, belong to bed mud and administer recovery technique field.
Background technology
Bed mud is the superficial deposit material of water bottom, is the mixture of microorganism, soil ulmin, soil and silt etc., is deposited on water bottom forms through long-time physical chemistry, biological action and water body transmission.Bed mud can reflect the historical process that water body develops, and is the important component part of the natural water ecosystems such as river, lake, mouth of the river beach.
Heavy metal in bed mud comes from atmospheric falling dust, precipitation, soil erosion, rainwash, all kinds of sewage, solid refuse and agricultural chemicals etc., there is the features such as chronicity, cumulative bad, latent and non-reversibility, can, by thousands of hundred times of ground enrichments of food chain, finally be detrimental to health.
The at present improvement planning of countries in the world to Heavy Metal Pollution in Sediments and to administer technical scheme different, especially in China, the factors such as contaminated and economic region affect, and still do not possess the condition of comprehensively carrying out Heavy Metal Pollution in Sediments control.According to the pollution level difference of polluted water body, in conjunction with the implementation condition of contaminated site, the recovery technique of at present conventional heavy metal polluted bed mud is mainly divided into in-situ treatment technology and dystopy treatment technology.
In-situ treatment technology mainly comprises original position phytoremediation and in-situ materials soverlay technique, its situ phytoremediation is low, simple to operate with its cost, be difficult for producing the advantages such as secondary pollution and receive much concern, but still existing processing efficiency low, plant growing is subject to the defect such as local climate, the impact of river course flood situation.In-situ materials soverlay technique is at bed mud surface coverage passivating material, blocking-up heavy metal is to the delivery pathways in water body, be subject to the physicochemical property of covering material and the water conservancy hydrological characteristics of natural water to affect larger, and there is no at present reliable covering material dispensing device, realize all even larger without leak source covering difficulty.Therefore, when larger, often adopt dystopy treatment technology for heavy contamination water body or in-situ treatment difficulty.
Dystopy treatment technology as disclosed in CN101921090A " a kind of heavy metal pollution bottle sediment curing agent and curing thereof ", mainly that the bed mud of dredging and heavy metals immobilization agent stirring and evenly mixing are cured, its solidifying agent comprises cement and flyash, and the mass ratio of flyash and cement is 1: (0.5~11).The curing of this solidifying agent comprises the following steps: in heavy metal polluted bed mud, directly add solidifying agent of the present invention, the consumption of solidifying agent is 0.4~1.5 times of heavy metal polluted bed mud quality, by at least maintenance 3d of mixture adding after solidifying agent, complete solidification process.This technology is by chemical process by the heavy metals immobilization in dredging bed mud, and it is useless that the solid waste after solidifying is still a kind of danger, and its follow-up disposal still needs to spend a large amount of funds.
The disclosed one of CN102372406 " the showering method of heavy metal polluted bed mud ", mainly by sediment digging and conveying, the antiseepage of reparation district and draining, bed mud modifying agent with microbial strains adds, microorganism and plant combined reparation, wastewater treatment and plant harvesting and incineration disposal unit form; Concrete steps are addressing and the antiseepage processing of first repairing district, adopt again engineering method that heavy metal polluted bed mud is dredged and is transported to and repair district, then carry out the discharging consolidation process of bed mud, then adding bed mud modifying agent and microbial strains fully mixes with bed mud and cultivates plant, after finally gathering in plant and being burned, burning that ash is transported to hazardous waste landfill landfill or for reclaiming heavy metal element.The method combines the dredging of bed mud dystopy with plant absorbing process method, compared with polluted bed mud chemical treatment method, there is low, the eco-friendly advantage of processing cost, but due to needs dredging, it easily produces to pollute and discharges in Dredging Process, affects overlying water water quality; In addition, for the heavier bed mud of pollution level, plant is difficult to grow in bed mud, has also limited the application of the method.
Summary of the invention
The present invention is directed to current Heavy Metal Pollution in Sediments and administer technological system, specific aim and handiness deficiency and the poor problem of regulation effect, in conjunction with valley harnessing work " control, with, protect " (so-called " controlling ", be Pollution abatement: refer to taking circular economy concept and industrial ecology as guidance, the whole process pollution prevention measure such as comprehensive adopt structural adjustment, cleaner production, end treatment, environmental infrastructure development, controlling area-source pollution, desilt and dredge, solves basin environment pollution problem.So-called " use ", be the abundant circulation of administrative local water resources: be economize on water be basis, suit measures to local conditions, guidance to different types of areas, make full use of idle wasteland and abandoned channel, the water facility of regulating and storing in construction, the reusing sewage engineering of making rational planning for, carry out to greatest extent the basin internal recycle of water resources, reduce quantity of wastewater effluent.So-called " guarantor "; be place, basin and function intensified: be on the basis of Pollution abatement and sewage recycling; adopt place, the reconstruction techniques such as wetland construction, soil conservation, small watershed exploitation improvement, natural reserve construction; the During Process of Ecological Restoration of watershed is strengthened, and makes it to improving self-purification capacity, improve water quality and ecotope, recovering self should have the beneficial direction of ecological functions to change as early as possible.) comprehensive regulation theory and the improvement principle of " minimizing, innoxious, resource utilization ", on the basis of extensively investigation, provide a kind of and can fully realize that place combines with governance process, suits measures to local conditions, simple to operate, the Heavy Metal Pollution in Sediments modularization dystopy improvement method of being convenient to enforcement.
Heavy Metal Pollution in Sediments modularization dystopy improvement method of the present invention, comprise that by enforcement order eliminating impurities, Sediment Dredging, silt separate, slurry dewatering subtracts appearance, solidification and stabilization, tail water processing, recycling and eight modules of place restoration of the ecosystem, above-mentioned module combines in conjunction with actual conditions and the disposal whereabouts at bed mud place place, and concrete function and the implementation process of each module are as follows:
(1) eliminating impurities: utilize ship as launch vehicle, remove river bed foreign material (rubbish, pasture and water, branch, plastics bag etc.) with artificial or mechanical type by rake or fishing jig, after foreign material drainage, pack is transported on the bank, transport to appointed place by dumper, this module is that optional dystopy is administered link;
(2) Sediment Dredging: take artificial or mechanical system that the bed mud that is subject to heavy metal or other pollution is cleared out from the system of waters; This module is that essential dystopy is administered link;
(3) silt separates: adopt vibratory screening apparatus to realize silt to the bed mud of dredging out and separate, after screening, can not meet that GB5058.3-2007 " Hazardous wastes judging standard leaching characteristic identification " specified requirement or other provincial standard require in sandstone, adopt clear water drip washing or chemical reagent drip washing to remove, drip washing equipment adopts roller-type stone washing machine or cylinder sand washer, and washing water enters tail water processing links; This module is that optional dystopy is administered link;
(4) slurry dewatering subtracts appearance: adopt the dehydration of mechanical dehydration or geotextile tube bag to subtract appearance to the mud after dredging or silt separate, this module is that essential dystopy is administered link;
(5) solidification and stabilization: in the time that the bed mud after dehydration cannot do sanitary landfill processing or have resourcebility utility value (while doing the purposes such as roadbed material, building materials), adopt cement solidification, lime solidify or chemical stabilization to the bed mud after dehydration is processed, this step block is that optional dystopy is administered link.
(6) tail water processing: the tail water producing in river sand drip washing and bottom-mud dewatering treating processes is carried out to pre-treatment, make it be back to water body, adopt integrated tail water treatment facility (existing general-purpose equipment) to carry out tail water processing; When heavy metal content in tail water exceedes GB8978-96) " integrated wastewater discharge standard " or other provincial standard be while requiring, adopts the method for flocculation sediment or the method processing of absorption, and this module is that essential dystopy is administered link;
(7) recycling: the bed mud after solidification and stabilization especially sandstone is utilized, comprise brickmaking, baking ceramsite, bank protection or as roadbed material, this module is that optional dystopy is administered link;
(8) place restoration of the ecosystem: to the contaminated site after administering with for administering the interim disposal field of engineering, adopt plantation to there is the plant (Indian mustard, the tired rape of ultraproduct, alfalfa, Chinese cabbage, rye grass, amaranth and Caulis Miscanthis floriduli etc.) of heavy metal accumulation ability, contaminated site and interim disposal field are carried out to place restoration of the ecosystem, and this step block is that essential dystopy is administered link;
Sediment Dredging, slurry dewatering in above-mentioned eight modules subtracts appearance, tail water processes and place restoration of the ecosystem is essential module, and all the other modules are chosen according to following condition:
Condition 1: when hydraulic gradient≤0.5%, foreign material volume content >=10% in bed mud, and while needing to adopt the contaminated site of dredging waterborne; Must select eliminating impurities module;
Condition 2: when the above sandstone composition of particle diameter 1mm volume ratio >=50% in bed mud, must select silt separation module;
Condition 3: in the time that heavy metal content in sandstone after screening exceedes GB5058.3-2007 " Hazardous wastes judging standard leaching characteristic identification " specified requirement or the requirement of other provincial standard; Must select silt separation module, adopt clear water drip washing or chemical reagent drip washing to remove;
Condition 4: in the time that the bed mud after dehydration cannot do sanitary landfill processing or have resourcebility utility value, must select solidification and stabilization module.
The present invention fully, in conjunction with various places Pollution abatement planning and polluted-water technology implementation difficulty, suits measures to local conditions, and will mainly administer sport technique segment modularization, stylize, be convenient to use for reference and operation, each module, can be in conjunction with place place specified conditions in the time of practical application, independent assortment, simple to operate, be convenient to implement.There is following characteristics:
1. the improvement principle of the comprehensive regulation theory of fully " controlling, use, protecting " in conjunction with valley harnessing work and " minimizing, innoxious, resource utilization ", has solved the situation of current Heavy Metal Pollution in Sediments control systematicness, specific aim and handiness deficiency.
2. take into full account place restoration of the ecosystem and ecological maintenance after the contingent various factors of construction process and construction, fully represented the systematicness of Heavy Metal Pollution Control work.
3. each module can, fully in conjunction with local specified conditions, have stronger specific aim.
4. each module can surmount arbitrarily under the prerequisite that meets respective combination implementation condition, and independent assortment has stronger handiness.
Brief description of the drawings
Accompanying drawing is the schematic flow sheet of Heavy Metal Pollution in Sediments modularization dystopy improvement method of the present invention.
Embodiment
As shown in drawings, Heavy Metal Pollution in Sediments moudle type dystopy system improvement method of the present invention is that one can be fully in conjunction with various places Pollution abatement and water conservancy dredging planning, and polluted-water and site technology enforcement difficulty, the system improvement method of suiting measures to local conditions, will mainly administer sport technique segment modularization, stylize, be convenient to use for reference and operation, each step block, can be in conjunction with place place specified conditions, independent assortment in the time of practical application, simple to operate, be convenient to implement.Specifically comprise following eight modules according to enforcement order:
(1) eliminating impurities: utilize ship as launch vehicle, remove the foreign material such as river bed rubbish, pasture and water, branch, plastics bag with artificial or mechanical type by rake or fishing jig, after foreign material drainage, pack is transported on the bank, transports to appointed place by dumper.
This step block belongs to optional module, is applicable to condition 1, that is: hydraulic gradient≤0.5%, and foreign material volume content >=10% in bed mud, and need adopt the contaminated site of dredging waterborne.
(2) Sediment Dredging: take artificial or mechanical system that the bed mud that is subject to heavy metal or other pollution is cleared out and processed from the system of waters.This step block, for showering processing, is that indispensable dystopy is administered link, is essential option.
Skip or complete after eliminating impurities module, just can start Sediment Dredging module, can be in conjunction with place place water conservancy hydrologic condition, adopt flexibly the methods such as engineering dredging of the prior art, environmental dredging and ecological dredging.
(3) silt separates: adopt vibratory screening apparatus to realize silt and separate, this step block belongs to optional module, is mainly applicable to condition 2, that is: the above sandstone composition ratio >=50%(of particle diameter 1mm volume ratio in bed mud) situation, subtract molar piece otherwise directly enter slurry dewatering.
After screening, in sandstone, satisfy condition 3, wherein heavy metal content exceedes " Hazardous wastes judging standard leaching characteristic identification " (GB5058.3-2007) specified requirement or other provincial standard requires, adopt clear water drip washing or chemical reagent drip washing to remove, drip washing equipment adopts roller-type stone washing machine or cylinder sand washer; Washing water enters tail water processing links.
(4) slurry dewatering subtracts appearance: dredging or through silt separate after mud moisture content high, particle is tiny, with the nutritive substance such as electronegativity, rich Nitrogen-and Phosphorus-containing; part is subject to the dredging bed mud of heavy metal severe contamination also often to contain the organism of various difficult degradations; under state of nature, dredging mud is difficult for mud-water separation, generally adopts the volume reduction method of mechanical dehydration or the dehydration of geotextile tube bag.This module is widely used in showering treating processes, is that indispensable dystopy is administered one of link, is essential option.This module can reduce subsequent disposal amount, concrete volume reduction method should be in conjunction with the recycling approach of mud cake after local Land use planning and dehydration.
(5) solidification and stabilization: the heavy metal stabilization technology of bed mud is used experience and the technology of sludge disposal or soil remediation aspect mostly, as cement solidification technology, lime curing technology, chemical stabilization technology etc., be mainly to utilize chemical agent to make hazardous and noxious substances change the process of low-solubility, low migration and hypotoxicity material into.Mainly contain polysulfide, cement, wilkinite, blast-furnace slag, silicate, lime, kiln ash, floating dust, Zhejiang green grass or young crops, red mud etc.
This module is option, is applied to when the bed mud after dehydration satisfies condition 4, when the bed mud after dehydration cannot do sanitary landfill processing or have resourcebility utility value.
(6) tail water processing: river sand drip washing and bottom-mud dewatering are processed the tail water producing in production process and need be carried out, after pre-treatment, just getting back to water body.Tail water is processed generally can adopt integrated tail water treatment facility (existing general-purpose equipment), (exceedes " integrated wastewater discharge standard " (GB8978-96) or other provincial standard requirement) and can adopt the method for flocculation sediment or the method for absorption when heavy metal content exceeds standard in tail water.This module is widely used in showering treating processes, is that indispensable dystopy is administered one of link, is essential option.
River sand drip washing and bottom-mud dewatering are processed the tail water that produces in production process can not be up to standard time, automatically start tail water processing module, near water body or do other comprehensive utilizations tail water discharge up to standard after processing.
(7) recycling: mainly refer to the especially comprehensive utilization of sandstone of bed mud after solidification and stabilization, mainly comprise brickmaking, baking ceramsite, bank protection or roadbed material etc.This module is option.
(8) place restoration of the ecosystem: mainly refer to the contaminated site after administering with for administering the interim disposal field of engineering, in conjunction with site condition, adopt plantation to there are the tired rape of Indian mustard, ultraproduct, alfalfa, Chinese cabbage, rye grass, amaranth and the Caulis Miscanthis floriduli etc. of heavy metal accumulation ability, contaminated site and interim disposal field are carried out to the restoration of the ecosystem of place, place.This module is widely used in showering treating processes, is that indispensable dystopy is administered one of link, is essential option, reaches the object of " guarantor ".
Sediment Dredging, slurry dewatering in above-mentioned eight modules subtracts appearance, tail water processes and place is four essential options, and all the other four is option, and four options are chosen according to its concrete application conditions.Below provide the module combination under several actual conditionses.
When contaminated site satisfies condition 1, when condition 2, condition 3 and condition 4, the module comprising by enforcement order is:
----silt separates (clear water or chemical leaching)----solidification and stabilization--tail water processing--recycling--place restoration of the ecosystem that slurry dewatering subtracts appearance to Sediment Dredging to eliminating impurities.
2. when contaminated site only satisfies condition 1 and when condition 4, the module comprising by enforcement order is:
Eliminating impurities--Sediment Dredging----solidification and stabilization--tail water processing--recycling--place restoration of the ecosystem that slurry dewatering subtracts appearance.
3. when contaminated site only satisfies condition 2 and when condition 4, the module comprising by enforcement order is:
Sediment Dredging--silt separation----solidification and stabilization--tail water processing--recycling--place restoration of the ecosystem that slurry dewatering subtracts appearance.
4. when the contaminated site module comprising 4 time that only satisfies condition by enforcement order is:
Sediment Dredging----solidification and stabilization--tail water processing--recycling--place restoration of the ecosystem that slurry dewatering subtracts appearance.
5. all do not satisfy condition 1 when Pollution Field is located in, when condition 2, condition 3 and condition 4, the module comprising by enforcement order is:
Sediment Dredging--place restoration of the ecosystem that slurry dewatering subtracts appearance--tail water processing--.
By that analogy, can obtain being suitable for different condition, suit measures to local conditions, simple to operate, be convenient to the Heavy Metal Pollution in Sediments modularization dystopy resolution implemented.

Claims (1)

1. a Heavy Metal Pollution in Sediments modularization dystopy improvement method, it is characterized in that: comprise that by enforcement order eliminating impurities, Sediment Dredging, silt separate, slurry dewatering subtracts appearance, solidification and stabilization, tail water processing, recycling and eight modules of place restoration of the ecosystem, concrete function and the implementation process of each module are as follows:
(1) eliminating impurities: utilize ship as launch vehicle, remove river bed foreign material with artificial or mechanical type by rake or fishing jig, after foreign material drainage, pack is transported on the bank, transports to appointed place by dumper, and this module is that optional dystopy is administered link;
(2) Sediment Dredging: take artificial or mechanical system that the bed mud that is subject to heavy metal or other pollution is cleared out from the system of waters; This module is that essential dystopy is administered link;
(3) silt separates: adopt vibratory screening apparatus to realize silt to the bed mud of dredging out and separate, after screening, can not meet that GB5058.3-2007 " Hazardous wastes judging standard leaching characteristic identification " specified requirement or other provincial standard require in sandstone, adopt clear water drip washing or chemical reagent drip washing to remove, washing water enters tail water processing links; This module is that optional dystopy is administered link;
(4) slurry dewatering subtracts appearance: adopt the dehydration of mechanical dehydration or geotextile tube bag to subtract appearance to the mud after dredging or silt separate, this module is that essential dystopy is administered link;
(5) solidification and stabilization: in the time that the bed mud after dehydration cannot do sanitary landfill processing or have resourcebility utility value, adopt cement solidification, lime solidify or chemical stabilization to the bed mud after dehydration is processed, this step block is that optional dystopy is administered link;
(6) tail water processing: the tail water producing in river sand drip washing and bottom-mud dewatering treating processes is carried out to pre-treatment, make it be back to water body, adopt integrated tail water treatment facility to carry out tail water processing; In the time that heavy metal content in tail water exceedes GB8978-96 " integrated wastewater discharge standard " or the requirement of other provincial standard, adopt the method for flocculation sediment or the method processing of absorption, this module is that essential dystopy is administered link;
(7) recycling: the bed mud sandstone after solidification and stabilization are utilized, comprise brickmaking, baking ceramsite, bank protection or as roadbed material, this module is that optional dystopy is administered link;
(8) place restoration of the ecosystem: to the contaminated site after administering with for administering the interim disposal field of engineering, adopt plantation to there is the plant of heavy metal accumulation ability, contaminated site and interim disposal field are carried out to place restoration of the ecosystem, and this step block is that essential dystopy is administered link;
Sediment Dredging, slurry dewatering in above-mentioned eight modules subtracts appearance, tail water processes and place restoration of the ecosystem is essential module, and all the other modules are chosen according to following condition:
Condition 1: when hydraulic gradient≤0.5%, foreign material volume content >=10% in bed mud, and while needing to adopt the contaminated site of dredging waterborne; Must select eliminating impurities module;
Condition 2: when in bed mud when the above sandstone composition of particle diameter 1mm volume ratio >=50%, must select silt separation module;
Condition 3: in the time that heavy metal content in sandstone after screening exceedes GB5058.3-2007 " Hazardous wastes judging standard leaching characteristic identification " specified requirement or the requirement of other provincial standard; Must select silt separation module, adopt clear water drip washing or chemical reagent drip washing to remove;
Condition 4: in the time that the bed mud after dehydration cannot do sanitary landfill processing or have resourcebility utility value, must select solidification and stabilization module.
CN201310498149.2A 2013-10-22 2013-10-22 Bottom sediment heavy metal pollution modularized ex situ treatment method CN103496833B (en)

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CN104803572B (en) * 2015-05-12 2016-08-24 山东省环科院环境工程有限公司 The dredging of ephemeral stream heavy metal polluted bed mud and dystopy administering method and system
CN105002884B (en) * 2015-06-04 2017-12-12 河海大学 A kind of river silt from the bottom of lake first solidifies the method excavated afterwards
CN104889149B (en) * 2015-06-10 2017-04-12 中国科学院地理科学与资源研究所 Ectopic classification leaching repair complete process of arsenic and heavy metal contaminated soil
CN106007276A (en) * 2016-05-25 2016-10-12 上海理工大学 Pretreatment and solidification method of heavy-metal-polluted river course sediment
CN106219860B (en) * 2016-08-16 2018-05-08 中电建水环境治理技术有限公司 River and lake pool gushes water reuse (treatment system more than polluted bed mud processing
CN106892546B (en) * 2017-03-13 2020-05-08 江苏中宜生态土研究院有限公司 Composite pollution river and lake bottom mud stabilization treatment method
CN106881340B (en) * 2017-03-14 2020-12-11 北京建工环境修复股份有限公司 Treatment method for heavy metal polluted farmland
CN108817026A (en) * 2018-05-25 2018-11-16 镇江新区固废处置股份有限公司 A kind of trash receptacle, solidification and landfill system
CN109111021A (en) * 2018-08-22 2019-01-01 苏州三体智能科技有限公司 A kind of soil repair system and its restorative procedure
CN110054378B (en) * 2019-05-14 2020-12-08 中国环境科学研究院 River and lake bottom repairing device and method

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JP2006116514A (en) * 2004-10-19 2006-05-11 Kangen Yoyu Gijutsu Kenkyusho:Kk System and method for recovering hydrogen energy which use biomass source of sewage sludge
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